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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

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Published on: July 26, 2016

Sampling requirements in near-field ptychography.

Luca Fardin, Yelyzaveta Pulnova, Tomáš Parkman

|April 12, 2025

Summary

This summary is machine-generated.

This study analyzes sampling requirements for near-field ptychography, a lensless microscopy technique. The findings generalize conditions for both near- and far-field setups, enabling wider applications, especially with low-brilliance sources.

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Last Updated: May 14, 2025

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Area of Science:

Optics and Photonics
Materials Science
Biophysics

Background:

Ptychography is a versatile lensless microscopy technique used across scientific disciplines.
The near-field ptychography setup, a recent advancement, offers significant potential yet to be fully realized.
Current understanding of near-field ptychography has limitations regarding optimal experimental design.

Purpose of the Study:

To analyze and generalize the sampling requirements for near-field ptychography.
To harmonize the theoretical framework for both near-field and far-field ptychography.
To provide guidelines for optimizing near-field ptychography experiments, particularly for low-brilliance sources.

Main Methods:

Analytical generalization of sampling conditions using the fractional Fourier transform formalism.
Leveraging existing literature characterizations of ptychography setups.
Computational simulations to validate theoretical findings.

Main Results:

Derived generalized sampling conditions applicable to both near-field and far-field ptychography.
Demonstrated harmonization of sampling requirements across different ptychography regimes.
Identified strategies to optimize experimental setups and data acquisition for near-field ptychography.

Conclusions:

The generalized sampling conditions expand the applicability of ptychography, especially for low-brilliance sources.
This work provides crucial insights for advancing near-field ptychography experiments.
The findings pave the way for broader adoption of ptychography in various scientific fields.